Rotatable spindle for tailstocks



L. E. LARSON ET AL ROTATABLE srmnm FOR I'AILSTOCKS Aug. 31 1926.

Filed August 24g19'25 2 Sheets-Sheet 1 Aug. 31, 192 1,598,380

L. E. LARSON ET AL RQTATABLE SPINDLE FOR TAILSTOCKS Filed Au ust- 24, 1925 2 Sheets-Sheet 2 M62 2 Z0122 (avian 0 m (aw-nail.

Patented Aug. 31, 1926. I i

siren STATES PATENT OFFICE.

LABS EDWARD LARSON AND DANA R. CORNELL, OF EAST CHICAGO, INDIANA, AS- SIGNORS TO STANDARD FORGINGS COMPANY, OF CHICAGO, ILLINOIS, A CORPORA- TION OF ILLINOIS.

ROTATABLE SPINDLE FOR TAILSTOCKS.

Application filed August 24, 1925. Serial No. 51.910.

This invention relates to improvements in In that form of our invention which we 55 tall stocks for lathes with rotatable spindles. have chosen for purposes of illustration in In heavy duty lathes and similar machine the accompanying drawings: tools used for removing large amounts of Figure 1 is a side elevation of a lathe metal with a cutting tool or removing same tail stock embodying our invention.

simultaneously with a plurality of cutting Figure 2 is an end elevation of the same, 60 tools, ditliculty has been experienced not and only in preserving the life of the tail stock Figure 3 is a sectional plan view, enlarged, spindle and its center and keeping the latter the section being taken upon the horizontal in proper condition but also in keeping the plane indicated by the dotted line 3-3 on work being operated upon in proper condi- Fig. 1. at.

tion,-the heavy load, the radial pressures In said drawings, A indicates a tail stock and thrusts, and other causes producing housing of any conventional form or type, sticking, heating, distorting and mutilation provided with a base 1, whereby it may be 1 not only of the article being machined but mova'bly secured in operative position upon also of, the tail stock center, and causing a lathe, and having a cylindrical, longitudi- 7 undue wear and shortening the life of the nally apertured body portion 2 adapted to tail stock center. receive a movable, cylindrical spindle holder The principal object of the present inven l3. Vithin the holder B is a spindle C tion is to produce a construction oi rotatwhich carries the tool-center D.

able spindle by the use of which sticking The body 2 is longitudinally bored as in- 7 and overheating and the other difliculties dieated at 3 to afford a bearing support for will be entirely avoided; a construction the holder B, the rear end of the body bore which will sustain heavy thrusts and ex'cesbeing closed by plug ca'p E, having screw sive radial Jressures without injury or mutithreaded engagement with the body 2 as inlation to the work or to the tool; a condicated at4. The tail stock A and cap E structiou which will not only be compact will usually be made of cast iron, while the but will sustain increased radial and load holder B, spindle C and center D will usually capacity over known constructions of simibe made of steel.

80 lar size; a construction which will be adapt- The holder B is provided at one end with able to the tail stock of machines now on a enlargement, and at its other end the as the market without altering the general outholder is provided with a steel nut 7 and, side dimensions of standard tail stock castpreferably, also with a bronze bushing 8 ings; a construction which will provide for between the nut 7 and the interior wall of 3 adjustment of the bearings as wear takes the holder. A steel screw 9 of considerable place and take up any looseness of the relative length passes through this nut 7. a"? spindle when it occurs, whereby the central It carries a non-threaded shank 10 which or axial line of the spindle will be mainpasses through the cap E and through a taincd in its original position; a construchand operating member or wheel F, which 40 tion which will permit of proper lubricalatter is firmly secured by the nut 11. The tion and yet reduce the frequency of relubrihub 12 of the wheel member bears asshown cation to a minimum; and generally, to proupon the outer face of the cap E while a duce a construction which will be compact, shouldered ring 18 on the shank 10 bears durable, which will serve the purposes inagainst the inner face of the cap. The nut tended, and which will remain in order for 7 and the bushing 8 may be suitably locked an indefinite period and prolong the life of by the screw bolt 14:. It will be understood by the machine. this arrangement that the holder B may be These and other objects and advantages moved longitudinally of, and thus suitably Off the invention will become apparent as we adjusted within, the body 2 of the tail stock 50 proceed withthis specification, the invenby means of the screw 9 actuated by the tion consisting of the devices and combinaoperating member F. tion of devices herein illustrated and de- The holder B is of tubular form as clearly scribed. and more particularly set forth in shown, the interior spaces being of three dittheappended claim. ferent diameters, as indicated by 15, 16 and 17. In the space 15 is a combined radial and thrust bearing, indicated as a whole by the letter G and in the space 17, is a similar bearing indicated as a whole by the letter G. These bearings G, G are well known to the art and as they form no part, per se, of this invention, and only as a bearing in connection with the other lfeatures, need not be herein more fully described. The inner rings 18 and 19 of said bearings, however, are of an interior diameter to receive and support the respective end portions oi: the rotatable spindle U, the latter however having no hearing or contact with the wall of the central portion 16, as shown.

it will be noticed that the inner ring member 18 is held against rear-shitting movement relative to the spindle by the adjusting nut 20, lock nut 21, washer and will therefore rotate with the spindle. Also that the inner ring member 19 is held against longitudinal outward nioven'ient relative to the spindle by the washer plate 26 on the spindle and interposed between the end of the ring member 15) and the inner face of the annular enlargement 23 ot' the spindle. Said ring 19 will therefore also rotate with the spindle. lt will be understood that by this construction, any loosencss in the bearing G, G due to wear or other cause, may be readily taken up and c-Lirrected by the adjusting nuts 20, 21.

Dust and dirt may be kept out of the space 17 by means of the cup shaped ring guard 24- positioned therein and having an inwardly directed annular flange nien'iber overlapping a washer plate 26.

The spindle C is 'interiorly bored at 27 to receive the fr e end of the screw 5) and at 28 to form a bearing for the steel center D, the aperture 28 being outwardly tapered as shown to conform to the conical or tapered circumferential area of the cen ter D, the working point 29 of which suitably projects beyond the face of the enlarged portion 23 ot' the spindle C.

The spindle holder B is locked against movement otrotation within the body 2 of the tail stock by a set screw key 30, or in any other suitable manner. The screw bolt 32 closes an oil hole radially extending through the wall of the holder B whereby a suitable lubricant may be inserted to fill the spaces 15, 16 and 17. The space 3 may also be provided with a suitable lubricant.

From the construction described, it will be understood that when the article to be operated upon, say a car axle, for example, in a lathe provided withthis invention, is suitably positioned, the point 29 of the center D will be engaged with the center in the end of the axle and suitably tightened thereto by the sliding forward of the holder B under the influence of the adjusting member F. The rotationof the axle asv the oporation proceeds, will cause the rotation of the center D and spindle U and this will be facilitated by the anti'lriction bearings (i, G. Heating of the center and of the drilled center in the axle will be entirely eliminated, and all mutilation or distortion 01: the axle obviated. Also the lite ot the center D will be indefinitely prolonged since rotating with the axle, it does not become scored or broken by reason of heavy bearing loads, sticking, excessive radial pressures or other causes.

.One 01": the advantages obtained by our invention is the elimination of need for lubrication of the "enter 1). lVlicre such centers are fixed, the need of and consequent expense of lubrication is caused by heating due to rotation of the work about a non-rotatable center, at its point, such as point 29, this being entirely avoided where the U rotates with. the work.

it will also be noted that the device is a d relatively small, is adapted to (1e tail stock ot many it not all of the ional lathes on the market, may be quickly adjusted, easily lubricated and by reason of its design, will in tact require lubrication only once a year under nornzal conditions of use.

ll hile we have described the preferred 'TTil 0'? our invention which, after a succe. -ul and satisfactory use for a considerable period of time, we recommend as a desirable form for most purposes. yet other terms may be used and changes and modifications as to details may he made without iileparting 'l'rom the principle of: our invention, and therefore we do not desire to be limited herein to the particular details here in illustrated and described, except pointed out in the claim hereto appended.

We claim our invention:

1- tail stock unit ada ited to retain a body of lubricant "for movable parts, comprising a fixed support having a cylindrical, radially contractablo body portion closed at one end, a cylindrical spindle holder closed atone end siidably mounted within said body portion, means journaled in the closed end oi said body portion and operatively engaging" the closed end of said spindle holder for axially adjusting); said spindle holder in said body portion, spaced bearings mounted within said spindle holder, a rotary spindle supported on said bearings. and extending through the open end of said spindle holder, a washer plate closing the space between said rotary spindle and said spindle holder adjacent its open end, and a work center carried by said rotary spindle.

testimony that we claim the foregoing" as our invention we aflix our signatures this 20th day of August, 1925. I

LAB-S EDlVARD LiiRSOii. DANA R. CORNELL.

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